There are hundreds of threads debating whether your should be ordering a Porsche with pccb or not, or if you should convert to iron from pccb, or if you should consider upgrading to pccb if you have standard iron brake.

Some argument are more obvious like cost, durability, dusting, squeaking etc. but these are not the intention of this discussion, as they are all subject to one's opinion and that's why the debate is going to continue, and when it comes to that decision you may still be struggling whether you should "pccb" or not "pccb".

So today I am going to present a deciding factor that is objective and quantitative, with the analysis of Moment of Inertia between two brake rotor materials, to prove the advantage of a light weight rotor such as pccb which might be helpful to your decision when "that time" comes again.

A quantity expressing a body's tendency to resist angular acceleration.
It is the sum of the products of the mass of each particle in the body with the square of its distance from the axis of rotation.

OE iron rotors design is not the same design as shown (RB), but they were simulated to have the same weight as OE.

OE pccb is an optional upgrade come with yellow calipers

RB-CCB is a system developed by RacingBrake for a 100% bolt on conversion for iron or pccb for easy and low cost on consumable such as pad and rotor discs.

As you can see from above table the advantage of installing a CCB brake, for example if you are to install 394/390mm RB CCB brake system your required effort to accelerate/decelerate is only 1/2 of a standard iron set up even with overisze rotor in the front, while if you adopted to pccb with 410mm in the front it requires 68% of the effort.